Cafeen,

I just wanted to comment that I enjoy your website and visit it on occasion when it comes up in hits of something I'm searching for. Some great info you've compiled.

You're going to enjoy these NR's. The 28 in particular I'm quite fond of although I have yet to run it or fly it. I've just had my eye on it for a while.

The engine is on the table as it is being used in stages of model design development. This engine is designed to put out power at high rpm so expect to turn smallish 8" props to get there. I'm interested in seeing how it performs on 9x5, 9x6 props as the engine will go into a pattern design. I have the standard NR 40040 fuse top header and muffled 50041 pipe for it. There is an 85 mm (~3.4") longer, 10 g heavier, quiet pipe as well (50042) if your model can accommodate it.

One thing I've noticed with most all NR engines is that they are optimized for power with short crankcases and shafts (among other things). As a result, the high speed needle on the the R528 has 1.5 mm clearance from the blade of an 8x6 prop when turned with the "L" facing forward. This is naturally too close for comfort so plan on using a spinner no matter what, There are 3/16" left of thread on the prop shaft simply with the prop bolted on - just enough for a spinner backplate. The prop nut is 5 mm thick and if slightly more thread is needed with a thicker backplate, a 3 mm nut (giving another 1/16" of thread) can probably be sourced. Alternatively, A Tru-Turn prop extension adapter can be used in conjunction with their spinners. Once the spinner backplate is on, the prop should be sufficiently forward for adjustment comfort. It would be intersting to know whether the 15 and 21 present the same situation.

I took a couple of snaps of it below. Maybe I should add one with the pipe as well.

Mitch, apologies but you have begun a NR engine thread!

David